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authorBen Bridle <ben@derelict.engineering>2025-01-06 17:19:06 +1300
committerBen Bridle <ben@derelict.engineering>2025-01-06 17:19:06 +1300
commit8b6bb67e39b59f68dc005550dd42f031b6f415e8 (patch)
tree7a606b03ee5f56ad1598fad4827b8d1358628ac4 /src/generate_html.rs
downloadtoaster-8b6bb67e39b59f68dc005550dd42f031b6f415e8.zip
Initial versionv1.0.0
Diffstat (limited to 'src/generate_html.rs')
-rw-r--r--src/generate_html.rs244
1 files changed, 244 insertions, 0 deletions
diff --git a/src/generate_html.rs b/src/generate_html.rs
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+++ b/src/generate_html.rs
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+use crate::*;
+
+use markdown::*;
+
+
+pub fn generate_html(document: &MarkdownDocument, page: &SourceFile, website: &Website) -> String {
+ format!("\
+<!DOCTYPE html>
+<head>
+<title>{} &mdash; {}</title>
+<meta charset='UTF-8'>
+<meta name='viewport' content='width=device-width, initial-scale=1'>
+{}
+</head>
+<body>
+<main>
+{}
+</main>
+</body>
+</html> \
+",
+ page.name, website.name,
+ get_html_head(document),
+ document_to_html(document, page, website)
+ )
+}
+
+
+
+pub fn get_html_head(document: &MarkdownDocument) -> String {
+ if let Some(Block::Fragment { language, content }) = document.blocks.first() {
+ if language == "embed-html-head" {
+ return content.to_string();
+ }
+ }
+ String::from("\
+<link rel='stylesheet' type='text/css' media='screen' href='static/screen.css'>
+<link rel='stylesheet' type='text/css' media='print' href='static/print.css'>
+<script src='static/render_math.js' defer></script> \
+ ")
+}
+
+
+
+pub fn document_to_html(document: &MarkdownDocument, page: &SourceFile, website: &Website) -> String {
+ let mut html = String::new();
+
+ macro_rules! line_to_html {
+ ($l:expr) => {{ line_to_html(&$l, page, website) }}; }
+ macro_rules! html {
+ ($($arg:tt)*) => {{ html.push_str(&format!($($arg)*)); html.push('\n'); }}; }
+ macro_rules! tag {
+ ($t:expr,$l:expr) => { html!("<{}>{}</{}>", $t, line_to_html!($l), $t) }; }
+ macro_rules! wrap {
+ ($t:expr,$f:expr) => {{ html!("<{}>", $t); $f; html!("</{}>", $t); }};
+ }
+
+ for block in &document.blocks {
+ match block {
+ Block::Heading { level, line } => match level {
+ Level::Heading1 => tag!("h1", line),
+ Level::Heading2 => tag!("h2", line),
+ Level::Heading3 => tag!("h3", line),
+ }
+ Block::Paragraph(line) => tag!("p", line),
+ Block::List(lines) => wrap!("ul", for line in lines {
+ // Insert a <br> tag directly after the first untagged colon.
+ let mut depth = 0;
+ let mut prev = '\0';
+ let mut output = String::new();
+ for c in line_to_html!(line).chars() {
+ output.push(c);
+ if c == '<' {
+ depth += 1;
+ } else if c == '/' && prev == '<' {
+ depth -= 2;
+ } else if c == ':' && depth == 0 {
+ output.pop(); output.push_str("<br>"); depth += 99;
+ }
+ prev = c;
+ }
+ match output.contains("<br>") {
+ true => html!("<li class='extended'>{output}</li>"),
+ false => html!("<li>{output}</li>"),
+ }
+ }),
+ Block::Note(lines) => wrap!("aside", for line in lines { tag!("p", line) }),
+ Block::Embedded { label, path } => match path.rsplit_once('.') {
+ Some((_, extension)) => match extension.to_lowercase().as_str() {
+ "jpg"|"jpeg"|"png"|"webp"|"gif"|"tiff" => html!(
+ "<figure><a href='{}'><img src='{}' alt='{}' title='{}'></a></figure>",
+ path, path, label, label
+ ),
+ "mp3"|"wav"|"m4a" => html!("<audio src='{path}' controls>"),
+ ext @ _ => error!("Unrecognised extension for embedded file '{path}' with extension '{ext}'"),
+ }
+ _ => error!("Cannot embed file '{path}' with no file extension"),
+ }
+ Block::Fragment { language, content } => {
+ match language.as_str() {
+ "embed-html" => html!("{}", content),
+ "embed-css" => wrap!("style", html!("{}", content)),
+ "embed-javascript"|"embed-js" => wrap!("script", html!("{}", content)),
+ "hidden"|"todo"|"embed-html-head" => (),
+ _ => {
+ html!("<pre class='{}'>", language);
+ html!("{}", sanitize_text(content));
+ html!("</pre>");
+ },
+ }
+ }
+ Block::Break => html!("<hr>"),
+ Block::Table(table) => wrap!("table", {
+ wrap!("thead",
+ wrap!("tr", for column in &table.columns {
+ tag!("th", column.name);
+ })
+ );
+ wrap!("tbody", for section in &table.sections {
+ for row in section {
+ wrap!("tr", for (column, cell) in std::iter::zip(&table.columns, row) {
+ let text_raw = line_to_html!(cell);
+ let text = match text_raw.as_str() {
+ "Yes" => "✓",
+ "No" => "✗",
+ other => other,
+ };
+ let align = match text {
+ "--" => "c",
+ _ => match column.alignment {
+ Alignment::Left => "l",
+ Alignment::Center => "c",
+ Alignment::Right => "r",
+ },
+ };
+ let class = match ["No", "--", "0"].contains(&text_raw.as_str()) {
+ true => format!("{align} dim"),
+ false => format!("{align}"),
+ };
+ html!("<td class='{}'>{}</td>", class, text);
+ })
+ }
+ });
+ })
+ }
+ }
+ return html;
+}
+
+
+
+fn line_to_html(line: &Line, page: &SourceFile, website: &Website) -> String {
+ let mut html = String::new();
+ for line_element in &line.tokens {
+ match line_element {
+ Token::Normal(text) => {
+ let text = &sanitize_text(text); html.push_str(text) }
+ Token::Bold(text) => {
+ let text = &sanitize_text(text); html.push_str(&format!("<b>{text}</b>")) }
+ Token::Italic(text) => {
+ let text = &sanitize_text(text); html.push_str(&format!("<i>{text}</i>")) }
+ Token::Monospace(text) => {
+ let text = &sanitize_text(text); html.push_str(&format!("<code>{text}</code>")) }
+ Token::Math(text) => {
+ let text = &sanitize_text(text); html.push_str(&format!("<span class='math'>{text}</span>")) }
+ Token::InternalLink(path) => {
+ let (label, class, path) = match path.split_once('#') {
+ Some(("", section)) => (section, "heading", format!("#{}", make_url_safe(path))),
+ Some((page, section)) => (section, "page", format!("{}.html#{}", make_url_safe(page), make_url_safe(section))),
+ _ => (path.as_str(), "page", format!("{}.html", make_url_safe(path))),
+ };
+ let full_label = sanitize_text(label);
+ let label = match full_label.split_once('/') {
+ Some((_parent, label)) => label.trim(),
+ None => &full_label,
+ };
+ // Check that the linked internal page exists.
+ if class == "page" {
+ let path_no_ext = path.strip_suffix(".html").unwrap();
+ if !website.has_page(&path_no_ext) {
+ error!("Page {:?} contains invalid link to {:?}", page.name, path_no_ext);
+ }
+ }
+ // Return to the site root before descending into a link.
+ let mut back = String::new();
+ let levels = page.full_url.chars().filter(|c| *c == '/').count();
+ for _ in 0..levels { back.push_str("../") }
+ html.push_str(&format!("<a href='{back}{path}' class='{class}'>{label}</a>"))
+ }
+ Token::ExternalLink { label, path } => {
+ let is_internal = path.find("/").is_none();
+ let (new_label, class, path) = match (is_internal, path.split_once("#")) {
+ (true, Some(("", frag))) => (sanitize_text(frag), "heading", format!("#{}", make_url_safe(frag)) ),
+ (true, Some((page, frag))) => (sanitize_text(frag), "page", format!("{}.html#{}", make_url_safe(page), make_url_safe(frag)) ),
+ (true, None) => (sanitize_text(path), "page", if path.contains(".") { path.clone() } else { format!("{}.html", make_url_safe(path)) } ),
+ (false, _) => (sanitize_text(path), "external", path.clone() ) };
+ let label = match label.is_empty() { true => new_label, false => sanitize_text(label) };
+ html.push_str(&format!("<a href='{path}' class='{class}'>{label}</a>"));
+ }
+ }
+ }
+ return html;
+}
+
+
+
+/// Replace each HTML-reserved character with an HTML-escaped character.
+fn sanitize_text(text: &str) -> String {
+ let mut output = String::new();
+ let chars: Vec<char> = text.chars().collect();
+ for (i, c) in chars.iter().enumerate() {
+ let prev = match i > 0 {
+ true => chars[i - 1],
+ false => ' ',
+ };
+ let next = match i + 1 < chars.len() {
+ true => chars[i + 1],
+ false => ' ',
+ };
+ match c {
+ '&' => {
+ // The HTML syntax for unicode characters is &#0000
+ if let Some('#') = chars.get(i+1) { output.push(*c) }
+ else { output.push_str("&amp;") }
+ },
+ '<' => output.push_str("&lt;"),
+ '>' => output.push_str("&gt;"),
+ '"' => match prev.is_whitespace() {
+ true => output.push('“'),
+ false => output.push('”'),
+ },
+ '\'' => match prev.is_whitespace() {
+ true => output.push('‘'),
+ false => output.push('’'),
+ },
+ '-' => match prev.is_whitespace() && next.is_whitespace() {
+ true => output.push('—'),
+ false => output.push('-'),
+ }
+ _ => output.push(*c),
+ }
+ }
+ return output;
+}
generated by cgit v1.2.3-70-g09d2 (git 2.49.0) at 2025-04-20 17:28:47 +0000